Shell-lining for paper-pulp-grinding mills.



A. F. & 0. B. BAHR. SHELL LINING roa PAPER PULP GRINDING MILLS.APPLIOATION FILED AUG. 5, 19134 Patented Mar. 23, 1915.

AMEL F. BARR AND OTTO B. BAH'R, 0F MARION, INDIANA.

SHELL-LINING FOR PAPER-PULP-GRINDING MILLS.

Specification of Letters Patent.

Patented Mar. 23, 19915.

Application filed August 5, 1913. Serial no. vaaaw.

To all whom it may concern:

Be it known that we, AMEL F. BAHR and OTTO B. BAHR, citizens of theUnited States, residing at Marion, in the county of Grant and State ofIndiana, have invented certain new and useful Improvements inShell-Linings for Paper-Pulp-Grinding Mills, of which the following is aspecification.

lhe present invention relates to improvements in paper pulp grindingmills, and has particular reference to the shell-linings for thesemills, the object in view being to pro vide linings which comprise oneor more longitudinal sections, each of these sections having its innersurface formed with peculiarly arranged blades or ribs. While it=hasbeen proposed heretofore to provide various arrangements of the internalribs in shell linings by means of which the pulp is more or lessretarded in its fiow through the mill, our particular arrangement isdesigned not only to prevent too rapid passage but to promote thedisintegrating action of. the pulp and to this end blades are formed inseries, the staggered arrangement of one series being cast at an angleto the arrangement of its adjacent series.

With the above and other objects in view, this invention consists in theconstruction, combination and arrangement of parts all as hereinaftermore fully described, claimed and illustrated in the accompanyingdrawings, wherein- Figure 1 is a lgngitudinal section of a mill showingthe application of our special form of shell-lining. Fig. 2 is anelevation of the lining alone. Fig.3 is avertical sectional view on theline 33 of Fig. 1 and showing a portion of the outer casing to which thelining is secured. Fig. 4 is a plan view of the inner surface of one ofthe longitudinal sections of which the shell-lining b ll is composed.

Throughout the following detail description, and on the several figuresof the drawings, similar parts are referred to by like referencecharacters.

Referring to the drawings and particularly describing the mill to whichour invention' is applied, the outer casing 1 is formed like a'hollowtruncated cone and is preferably constructed of metal or of wood suitedfor this purpose withits larger end open and its smaller end closed bytheintegral cover 2. The larger open end por tion of the casing 1 isprovided with a re" movable cover 3 which is fitted to the face of theflange portion 4: to form a close joint, being secured by means of bolts5. Revolubly mounted within the mill casing 1, on the shaft 6 is acenter or plug 7 keyed upon the shaft 6 and provided on its peripherywith staves 8. This plug has a true conical surface and as is usual thesurface is provided with a plurality of longitudinal knives 9 disposedbetween the staves 8 as shown most clearly in Fig. 1 of the drawings,these knives cooperating with the knives or blades formed on theshell-lining 10 which is secured to the inner portion of the casing 1 bymeans of bolts or similar fastenings 11.

Our invention resides primarily in the construction of the shell-liningas will now be described.

Since the casings 1 of mills are often con structed of wood or even whenof metal, the constant use causes a certain amount of wear so that therenewing of the shell-lining becomes a difficult matter when it isconsidered that most of these linings are composed of hollow truncatedcone sections. Furthermore, in certain makes of the casings are providedanchor bars arranged longitudinally at intervals around the insidecircumference and these project above the interior surface of the shell,making it im practlcal to properly fit the circular cone sections ofwhich the lining may be composed. For this reason we have constructedour shell-lining in one or more longitudinal sections as shown mostclearly in Figs. 2, 3 and 4, the illustration of complete liningcomprising four such sections. It would be obvious that by reason of theuse of the longitudinal sections, linings can be very easily placedbetween the anchor bars 12 which project inwardly from the interiorcasing 1 and when tightly positioned the several sections may be securedin position by the bolts 11, which pass through openings 11 in thelining sections. Each of these longitudinal sections is provided with apeculiar arrangement of blades or ribs designed particularly to prpperlydisintegrate the paper pulp in its cooperation with the revoluble plug8, the passage of the pulp through the mill being properly retarded sothat the mastication may be very thorough.

F tween the lining and the cooperating ber of these series beingarbitrary and governed according to the character of the pulp with whichthe machine is used. Furthermore, each of the series above referred toconsists of opposing annular rows of blades, a, a, b, b, c, 0', etcetera, that is to say, the blades of one row are staggered in relationto the blades of its adjacent row, the blades of both rows beingparallel and di agonally'formed upon the interior surface of the shellsection. This staggered arrangement forces the pulp to pass from one rowto the next row over the ends of the blades and is, therefore,thoroughly ground beplug 8. In addition to the foregoing, the blades ofalternating series are disposed at angles to the blades of its adjacentseries, the result of this formation being to cause the pulp in passingthrough the machine to take a serpentine path and thereby retard itsflow so that it will be properly masticated when it issues from itsgrinding process. This particular arrangement of blades provides theretarding action as above described which is usually accomplished by theprovision of lugs in various forms of shelllinings but the use of theselugs is accompanied by numerous disadvantages which are overcome by ourretarding arrangement.

Having thus described the invention, what is claimed as new is:

1. A lining shell for paper pulp grinding mills comprising a hollow bodyand means thereon for imparting to the pulp a tortuous movement,comprising a series of spaced annularly arranged blades, other bladesdisposed to close the spaces between said first mentioned blades wherebyto impart to the pulp an in and out movement with respect to thelongitudinal axis of the lining, and still other blades arranged atangles to the last mentioned blades whereby to impart to the pulp atortuous movement circumferentially of the lining.

2. A lining shell for paper pulp grinding mills comprising a hollow bodyhaving internal longitudinal blades or ribs for imparting to the pulp atortuous movement, said blades being spaced and arranged in a pluralityof annular rows, the blades of one row being arranged to close thespaces between the blades of the adjacent row where by to form aninterrupted path to the flow of the pulp through said spaces, the bladesof the next row adjacent the last mentioned being arranged to close thespaces between the blades of said last mentioned row and also disposedat a position diagonal with respect thereto, to the longitudinal axis ofthe lining.

In testimony whereof we affix our signatures in presence of twowitnesses.

AMEL F. BAHR. OTTO B. BAHR. Witnesses:

CoRA SAUMENIG, VICTOR Onmvnn.

and angularly with respect "T

